I have been using them for about two months, not a lot of miles on them yet but I have had no problems. They retain air better than a latex tube. They are pricy, which many people feel is a little to expensive for a tube.

I have been using them for about two months, not a lot of miles on them yet but I have had no problems. They retain air better than a latex tube. They are pricy, which many people feel is a little to expensive for a tube.

Thanks for the info. Have you tried them on descends? I would really like to give them a go, but a little worried about high speed punctures etc.

If something it sharp enough to get completely thru your thick tire to the tube... it's almost certainly going to puncture the tube, regardless of the weight of tube. I'd be more concerned with surface wear around the valve stem other spots inside the rim.

Also... at around $67.00 per tube, for a weight savings of only 20 grams over the Supersonics which are $14 bucks... that's quite expensive per/gram.

Anyway... I don't think they have really hit the market yet, and I saw their site at least a year or so ago.

Well, I think they have hit the market, atleast here in Denmark and we are usually not in front of rest of Europe. I have 2 and both came in at 32 grams, which is pretty close to the claimed 29 gram.

Good point about wear, these will not be for every day use i guess.

The valve has kind of a big alloy head where it's connected with the tube so don't suppose there will be wear issues there.

The price is extreme, but if you break it down to price per gram saved compared to Michelin Latex or similar it's quiet good. I have read too many negative reviews of the super sonic tubes to consider them.

My biggest fear is that their very thin nature will result in a blow up on a descend like it was sometimes reported in the early days with latex tubes. But hope these swiss guys have done their homework

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